The paper discusses the occurrence and enrichment causes of gallium in coals from Shanxi Formation and Taiyuan Formation in Yangj iawan exploration area in Baode· Based on the geological data from drilling Y501 in coal exploration,it obtains that gallium in Y501 coal varies between 5 and 35μg/g,and the average content is 20μg/g· The results of ash components clus-tering and relative analysis show that the gallium content is positively correlated to the coal ash, Al2 O3 and negatively correlated to the ash components of CaO,SO3 ,Fe2 O3 ,which indicate that the gallium in Y501 coal occurs mainly in clay minerals and aluminum hydroxides rather than py-rite,apatite and other primary minerals,and the gallium is mainly derived from the intermediate-acid igneous rocks of Yinshan mountain· The vertical comparison between the content of gallium and sedimentary environment parameters implies that the peat bog with weaker reducibility and stronger water dynamic might be conductive to the accumulation of gallium.%分析了保德杨家湾勘查区太原组、山西组煤中镓的赋存形式和富集成因.根据煤炭勘查钻孔Y501的资料,该孔煤样中镓含量5~35μg/g,平均20μg/g.煤灰成分聚类及相关分析显示,煤中镓含量与灰分、灰成分氧化铝正相关,与灰成分氧化钙、氧化硫、氧化铁负相关,表明煤中镓的主要载体是粘土矿物和铝的氢氧化物,黄铁矿、磷灰石等原生矿物中贫镓,镓的主要来源是北部阴山的中酸性火成岩.通过镓含量与沉积环境参数的垂向对比,发现还原性较弱、水体动荡的沼泽环境利于煤中镓富集.
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